html,
body {
  margin: 0;
  padding: 0;
  margin: 0 auto;
  box-sizing: border-box;
}
/*ͷ����������*/
.head {
  width: 100%;
  background-color: #fff;
  position: relative;
}
.head .back a {
  width: 50px;
  height: 43px;
  position: absolute;
  left: 0px;
  font-size: 18px;
  text-align: center;
  line-height: 43px;
  vertical-align: middle;
  color: #fff;
}
.head .back a:hover {
  text-decoration: none;
}
.head .home a {
  position: absolute;
  width: 50px;
  height: 44px;
  right: 0px;
  background-color: green;
  background: url("../../images/header_app.png");
  -webkit-background-size: 32px;
  background-size: 32px;
  padding: 6px 9px;
  background-clip: content-box;
  -webkit-background-origin: content-box;
  background-origin: content-box;
}
.head h1 {
  background-color: #ff841d;
  padding-left: 50px;
  padding-right: 50px;
  height: 44px;
  text-align: center;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  line-height: 44px;
  margin: 0;
}
/*ͷ����������*/
